金 珉廷

<jats:title>Abstract</jats:title><jats:sec><jats:title>Background</jats:title><jats:p>Submental intubation is an airway management technique wherein an endotracheal tube is guided through incisions in the floor of the mouth and the submental skin after normal orotracheal intubation.</jats:p></jats:sec><jats:sec><jats:title>Case presentation</jats:title><jats:p>A 20‐year‐old man with a history of pharyngeal flap construction for a cleft palate was planned for orthognathic surgery. Preoperative nasopharyngoscopy showed that the space lateral to the flap was too narrow for nasotracheal intubation; then submental intubation was performed. No intra‐ or postoperative complications were observed.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>Submental intubation is a useful alternative to tracheotomy in patients with difficulty in nasotracheal intubation during surgeries requiring occlusal confirmation.</jats:p></jats:sec>

<jats:title>Abstract</jats:title><jats:sec> <jats:title>Background</jats:title> <jats:p>The COVID-19 pandemic led to concerns about the potential airborne transmission of the virus during dental procedures, but evidence of actual transmission in clinical settings was lacking. This study aimed to observe the behavior of dental sprays generated from dental rotary handpieces and to evaluate the effectiveness of high-volume evacuators (HVEs) using laser light sheets and water-sensitive papers.</jats:p> </jats:sec><jats:sec> <jats:title>Methods</jats:title> <jats:p>A dental manikin and jaw model were mounted in a dental treatment unit. Mock cutting procedures were performed on an artificial tooth on the maxillary left central incisor using an air turbine, a contra-angle electric micromotor (EM), and a 1:5 speed-up contra-angle EM (×5EM). Intraoral vacuum and extraoral vacuum (EOV) were used to verify the effectiveness of the HVEs. The dynamics and dispersal range of the dental sprays were visualized using a laser light sheet. In addition, environmental surface pollution was monitored three-dimensionally using water-sensitive papers.</jats:p> </jats:sec><jats:sec> <jats:title>Results</jats:title> <jats:p>Although the HVEs were effective in both the tests, the use of EOV alone increased vertical dispersal and pollution.</jats:p> </jats:sec><jats:sec> <jats:title>Conclusions</jats:title> <jats:p>The use of various types of HVEs to reduce the exposure of operators and assistants to dental sprays when using dental rotary cutting instruments is beneficial. The study findings will be helpful in the event of a future pandemic caused by an emerging or re-emerging infectious disease.</jats:p> </jats:sec>